My Inquiry
My Account
STMicroelectronics TS861IDT
- Part No.:
- TS861IDT
- Manufacturer:
- STMicroelectronics
- Category:
- Comparators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TS861IDT.pdf
- Description:
- IC COMPARATOR 1 GEN PUR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,063
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
TS861IDT from STMicroelectronics is a single-channel rail-to-rail input, push-pull output micropower comparator operating from 2.7 V to 10 V, consuming only 6 µA per comparator at 2.7 V, with 500 ns propagation delay under 100 mV overdrive, and featuring ±12 V differential input voltage tolerance - deployed in battery-powered smoke detectors and portable communication systems.
For engineers reviewing the TS861IDT datasheet, TS861IDT pinout, TS861IDT application, or TS861IDT equivalent, key selection criteria include ultra-low supply current, rail-to-rail CMOS input range (VCC − 0.3 V to VCC + 0.3 V), push-pull output eliminating external pull-ups, 2.7–10 V supply flexibility, and SOT23-5/SO-8 package options for space-constrained designs.
Technical Context
The TS861IDT uses BiCMOS process technology to achieve ultra-low quiescent current (6 µA typ. at 2.7 V) while maintaining fast response (500 ns typ. propagation delay at 100 mV overdrive). Its rail-to-rail input stage supports common-mode voltages from VCC − 0.3 V to VCC + 0.3 V across the full 2.7–10 V supply range.
The push-pull output drives logic-level loads directly without pull-up resistors, delivering VOH = 2.35 V (min.) and VOL = 0.45 V (max.) at ISOURCE/ISINK = 2.5 mA with 2.7 V supply - enabling direct interfacing with 3.3 V or 5 V microcontrollers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply voltage | 2.7 V to 10 V - supports single-cell Li-ion, dual-cell alkaline, and 5 V/9 V industrial rails without regulation. |
| Supply current | 6 µA per comparator at 2.7 V - enables >10-year battery life in low-duty-cycle sensor wake-up applications. |
| Propagation delay | 500 ns typ. at 100 mV overdrive, 2.7 V - balances speed and power for event-triggered detection circuits. |
| Input offset voltage | 3 mV (min), 7 mV (max) - ensures reliable threshold detection with <10 mV hysteresis design margin. |
| Input common-mode range | VCC − 0.3 V to VCC + 0.3 V - allows direct sensing of battery voltage or sensor outputs near supply rails. |
| Output type | Push-pull CMOS - eliminates need for external pull-up resistor, reducing BOM count and board area. |
| ESD protection | 2 kV HBM - provides robustness against handling and system-level ESD transients in portable enclosures. |
Pinout & Package
SOT23-5 package: 5-pin surface-mount, 2.9 mm × 1.6 mm footprint, 1.3 mm height, ECOPACK® compliant.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting input (−) | Differential input terminal; accepts rail-to-rail signals from 0 V to VCC. |
| 2 | Non-inverting input (+) | Differential input terminal; supports same rail-to-rail common-mode range as Pin 1. |
| 3 | VCC+ | Positive supply connection; operates from 2.7 V to 10 V with no external decoupling required for basic use. |
| 4 | Output | Push-pull CMOS output; sinks/source up to 2.5 mA; compatible with 3.3 V/5 V logic inputs. |
| 5 | VCC− / GND | Ground reference; must be connected to system ground plane for stable operation and ESD path. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail CMOS inputs | Enables accurate threshold comparison across full supply range - critical for battery voltage monitoring down to 2.7 V. |
| Push-pull output stage | Drives microcontroller GPIOs directly without pull-up resistors - reduces component count and layout complexity. |
| Ultra-low 6 µA supply current | Extends battery life in intermittent-sensing applications such as smoke detector standby mode. |
| 500 ns propagation delay at 100 mV overdrive | Provides timely response to fast transients (e.g., gas sensor step outputs) without excessive power penalty. |
| Latch-up immunity (Class A) | Guarantees robust operation under transient overvoltage or ESD stress - essential for field-deployed safety devices. |
Applications
| Smoke Detector Threshold Sensing | Portable Gas Sensor Interface |
|---|---|
|
Use Scenario: Detects ionization chamber current drop indicating smoke presence in battery-powered residential alarms. IC Role / Device Role / Timing Role: Comparator compares chamber current-derived voltage against precision reference to trigger alarm logic. Use Value: 6 µA quiescent current enables >5-year CR123A battery life in standby; rail-to-rail input captures weak signal swings near ground. |
Use Scenario: Converts electrochemical gas sensor output (mV-level analog) into digital alert signal in handheld CO monitors. IC Role / Device Role / Timing Role: Threshold detector comparing sensor output to calibrated trip point; push-pull output drives MCU interrupt pin. Use Value: 500 ns response ensures sub-millisecond detection of rapid gas concentration rise; 2.7 V min. supply supports single-AA operation. |
| Battery Voltage Monitor | Low-Power Wake-Up Trigger |
|
Use Scenario: Monitors Li-ion cell voltage during deep sleep in Bluetooth trackers to initiate recharge or shutdown. IC Role / Device Role / Timing Role: Precision comparator with internal hysteresis detects VBAT crossing 3.0 V or 2.8 V thresholds. Use Value: Input offset voltage ≤7 mV ensures accurate 30 mV hysteresis window; rail-to-rail input measures down to 2.7 V cutoff. |
Use Scenario: Wakes ultra-low-power MCU from STOP mode when photodiode or PIR sensor output exceeds ambient baseline. IC Role / Device Role / Timing Role: High-speed, low-power comparator generating clean edge to EXTI line with minimal latency. Use Value: Push-pull output avoids RC time constant delays from pull-up networks; 6 µA draw preserves sleep current budget below 1 µA. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMV331M5X/NOPB | Higher supply current (17 µA), open-drain output requiring external pull-up, wider offset (±9 mV). | Less suitable for battery-critical systems; requires additional resistor and PCB area. | Choose if cost sensitivity outweighs power and layout constraints. |
| TLV3691DBVR | Lower supply current (320 nA), but slower (6 µs delay), rail-to-rail input only (not output). | Better for multi-year coin-cell applications where speed is secondary to energy harvesting duty cycles. | Prefer for nanowatt standby; avoid where <1 µs response is required for event capture. |
Compared with LMV331M5X/NOPB, TS861IDT saves >70% supply current and eliminates pull-up components; versus TLV3691DBVR, it delivers >10× faster response at only ~20× higher quiescent current - optimizing for responsive, long-life battery operation.
Availability
TS861IDT is available at Aetrix Electronics and suitable for battery-powered alarms, portable gas detectors, and low-power wake-up triggers requiring stable component supply across industrial temperature ranges (−40 °C to +85 °C).
Supply support for TS861IDT includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.
The TS86x family was developed specifically for ultra-low-power, rail-to-rail comparator applications in portable and safety-critical equipment - emphasizing micropower efficiency, robust input/output behavior, and wide supply voltage flexibility.
FAQ
What is the maximum supply voltage for TS861IDT?
The absolute maximum supply voltage is 12 V, but the recommended operating range is 2.7 V to 10 V per datasheet Table 2. Operation above 10 V risks exceeding thermal limits and degrading long-term reliability, even if within absolute max ratings.
Does TS861IDT require external hysteresis?
No - hysteresis is not built-in, but the device's low input bias current (≤600 pA) and rail-to-rail input enable stable external hysteresis network design using high-value resistors (e.g., 10 MΩ) without significant error contribution.
Can TS861IDT drive an LED directly?
No - its push-pull output is rated for 2.5 mA sink/source at 2.7 V (VOL ≤ 0.45 V, VOH ≥ 2.35 V), insufficient for typical LED forward currents (>5 mA). It must interface via a transistor or dedicated driver stage.
Is TS861IDT pin-compatible with other TS86x variants?
TS861IDT (SO-8) shares identical pinout with TS862IDT (dual) and TS864IDT (quad) for Pins 1–4 and 7–8, but Pin 5 (NC on dual/quad) is VCC− on TS861IDT - direct substitution requires schematic review and layout adaptation.
TS861IDT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- General Purpose
- Number of Elements:
- 1
- Output Type:
- Push-Pull
- Voltage - Supply, Single/Dual (±):
- 2.7V ~ 10V
- :
- 15mV @ 5V
- Voltage - Input Offset (Max):
- 300pA @ 5V
- Current - Input Bias (Max):
- -
- Current - Output (Typ):
- 16µA
- Current - Quiescent (Max):
- 70dB CMRR
- CMRR, PSRR (Typ):
- 2µs
- Propagation Delay (Max):
- -
- Hysteresis:
- -40°C ~ 85°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 8-SOIC
TS861IDT FAQ
1.How can I place an order for TS861IDT through Aetrix?
Please submit a Request for Quotation (RFQ) for TS861IDT on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for TS861IDT reliable?
The price and inventory of TS861IDT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TS861IDT is usually 5 days.
3.What payment methods are accepted for TS861IDT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TS861IDT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TS861IDT?
TS861IDT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TS861IDT order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for TS861IDT?
For technical support, including TS861IDT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TS861IDT requirements.
6.How does Aetrix verify that TS861IDT is sourced from the original manufacturer or authorized distributors?
All TS861IDT products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that TS861IDT meets industry standards.
7.What is the process for return or replacement of TS861IDT?
All TS861IDT units undergo pre-shipment inspection (PSI). If there is an issue with TS861IDT, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The TS861IDT part is unused and in its original packaging.
Return procedure for TS861IDT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TS861IDT Tags
-
LM2903DR
Texas Instruments
-
LM339DR
Texas Instruments
-
LM339PWR
Texas Instruments
-
LM393DT
STMicroelectronics
-
LM2901PWR
Texas Instruments
-
LM2903DT
STMicroelectronics
-
LM393DR
Texas Instruments
-
LM239DR
Texas Instruments
-
LM339APWR
Texas Instruments
-
LM2903P
Texas Instruments
-
LM393ADR
Texas Instruments
-
NCX2200GMAZ
NXP Semiconductors
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
